[APM] Suggestion to remove "Kuery" bar from Logs view in APM service overview experience

[alex-fedotyev]

Problem
Based on early feedback it seems that search bar experience in Logs tab brings different expectations than we designed:

Users are expecting to use search bar to search logs, but we implemented a different logic.

Current logic is to use kuery bar to allow filtering by service metadata like service.version or cloud.availability.zone.
Unfortunately some of those fields are available in APM index and not in the logs indices, and therefore it is not clear how to provide both ability to filter down by service metadata and search logs at the same time.

Alternative proposal
As an alternative in 7.15 we could wire kuqery bar to search logs (which matches users expectation), but lose ability to filter by service metadata.

Versions
Kibana: 7.15
APM Server: (if relevant)
Elasticsearch: (if relevant)

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)